"Designed with fun in mind, this kit features a custom designed full color label and a bright flashing red LED. Perfect for bedrooms, dorm rooms, teachers' desks, offices, or any other place that you would like to express yourself. These fun and easy-to-build kits make a perfect introduction to basic electronic circuit theory and transistor function. Using 2 transistor circuitry powered by one 9V battery (not included), each kit provides hours of blinking amusement. Size of PC Board: 3 1/4"" x 4 3/4"". Complete with all parts, PC board, color label and instructions. Skill Level 1. "